describe('onAdd', function () {
    /////////////////////////////
    // SETUP FOR EACH TEST
    /////////////////////////////
    var map, div;

    beforeEach(function () {
        div = document.createElement('div');
        div.style.width = '200px';
        div.style.height = '200px';
        document.body.appendChild(div);

        map = L.map(div, {trackResize: false});

        map.fitBounds(new L.LatLngBounds([
            [1, 1],
            [2, 2]
        ]));
    });

    afterEach(function () {
        map.remove();
        document.body.removeChild(div);

        map = div = null;
    });

    /////////////////////////////
    // TESTS
    /////////////////////////////
    it('throws an error if maxZoom is not specified', function () {

        var group = new L.MarkerClusterGroup();
        var marker = new L.Marker([1.5, 1.5]);

        group.addLayer(marker);

        var ex = null;
        try {
            map.addLayer(group);
        } catch (e) {
            ex = e;
        }

        expect(ex).to.not.be(null);
    });

    it('successfully handles removing and re-adding a layer while not on the map', function () {
        map.options.maxZoom = 18;
        var group = new L.MarkerClusterGroup();
        var marker = new L.Marker([1.5, 1.5]);

        map.addLayer(group);
        group.addLayer(marker);

        map.removeLayer(group);
        group.removeLayer(marker);
        group.addLayer(marker);

        map.addLayer(group);

        expect(map.hasLayer(group)).to.be(true);
        expect(group.hasLayer(marker)).to.be(true);
    });
});